From decree number 65 of 23 March 1929
As of the 1st of April, 1929 the postal service will have the following rates for items sent within the Republic of Panama:

•  Letters of no more than 20 grams: 2 cents
• Letter cards: 2 cents
• Letter and post cards introduced late: 1 cent
• Single post cards: 1 cent
• Double post cards: 2 cents
• Printed matter (newspapers, literary magazines): FREE
• Calling cards, congratulation cards, mourning cards, open advertisement, catalogs, maps, pictures, blueprints, printing proofs, merchandise without value, serial publications, for each 50 grams: ½ cent
• Business papers for each 50 grams: ½ cent
• Business samples for each 50 grams: ½ cent
• Bundle objects for each 50 grams: ½ cent
• Certification fee for local and international service: 10 cents
• Acknowledgment of receipt (A.R.) service: 5 cents

• The same rates as for the Republic of Panama for those items sent to UPU members
• Printed matter for each 50 grams:  ½ cent

      For the Diplomatic correspondence, such correspondence must have a notation that reads:
FRANQUICIA POSTAL PAN-AMERICANA-SERVICIO DIPLOMATICO and be subject to the following fees for foreign destinations :

• Letters of no more than 20 grams: 5 cents
• For each 20 grams, an additional 3 cents
• For a letter card: 5 cents
• Letters and post cards introduced late: 1 cent
• Single post cards: 2 cents
• Double post cards: 4 cents
• Printed matter for each 50 grams: 1 cent
• Business papers for each 50 grams: 1 cent
• Business samples for each 50 grams: 1 cent
• Registration service for items within the Republic and to foreign destinations: 10 cents
• Acknowledge of receipt (A.R.) service: 5 cents
• Special delivery service local: 10 cents
• Special delivery for international service: 20 cents
• Official inquires on status of postal packages or certified items: local 5 cents, from outside the Republic, 10 cents

From decree number 10 of 22 January 1930

From the date of this decree the following air mail rates will be in-effect:

• For mail service from Panama to David for first 15 grams: 5 cents; for each additional 20 grams: 2 cents
• All air mail correspondence to Europe, Africa, Asia and the Pacific sent via the US will pay the air mail rate + the regular postal rate according to its weight.

From Decree number 150 of 11 August 1931
 

From decree number 205 of 28 November 1931
 

• For the inauguration of the 1st air mail service within the Republic of Panama a stamp (Scott C-15) was issued and valid only on letters of no more than 15 grams carried on special flights on the 28th and 29th of November 1931: 5 cents

Fees for local mail service:

• 1st class surface mail for each 20 grams: 2 cents
• Air mail service for each 15 grams: 5 cents + the regular surface mail fee of 2 cents

From decree number 92 of 18 August 1937
 

• As of the 1st of September 1937 incoming postal packages will be charged 15 cents and paid in postage stamps. The stamps will be adhered to the custom forms.

As of the 1st of October 1937 the following service will be established:

• A special certified service to Spain and the Americas only is established without the right to indemnification for mailings that contains books, newspapers and other printed matter, business papers and business samples without value.  The certification rate is 5 cents per object + their regular mailing fee.
• 1st class surface mail to Panama, to Spain and to the Americas for each 5 grams: 2 cents